Panasonic FX48 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Casio EX-Z550 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the FX48 and EX-Z550 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic FX48 and Casio EX-Z550 Cameras
Panasonic FX48 and Casio EX-Z550 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Panasonic FX48
or the
Casio EX-Z550 ,
including hyperfocal distance.